Check out the Surface forums, but especially http://answers.microsoft.com/e...
That link will take you to page 71 of the complaints, which corresponds to the 2/17 date of the latest firmware release that was supposed to fix all this. Scan through the next few dozen pages (we're up to around 90 now), and you'll see that not only did the fix not work, it made things a lot worse for many people. (I cannot rely on my SP4 to wake at all after the update...)
Microsoft is sweeping this under the rug, and not acknowledging that the SP4/SB cannot even deliver on the basic sleep/wake capabilities of 20 years ago, let alone do so with the promised greatly improved battery life: (See image at: http://fud.community.services....)
In the meantime, thousands of users are left with computers that they cannot even use to do their daily work, and Microsoft remains silent about the debacle.
To be fair, I now think this is more Intel's problem then Microsoft's — it appears that the Skylake hardware is fatally flawed, and Intel and Microsoft are trying in vain to patch around the flaws with firmware, drivers, and software. As Dennis Miller says, "That's just my opinion — I could be wrong..." (but I'm afraid I'm not...)